Frame Maintenance - Drilling Precautions - F-Super Duty and Excursion
DRILLING PRECAUTIONS - F-SUPER DUTY AND EXCURSION1. Holes that would weaken the frame side member should not be drilled in the frame.
2. Holes are not to be drilled in the sidemember's top or bottom flange.
3. Holes to mount brackets, out-riggers and supports, may be drilled in the vertical frame side rail web with the following restrictions:
- Material between edge of hole and inside of upper or lower flange must not be less than 1.50 inch for low carbon steel (36,000 psi yield).
- The minimum edge distance between any two holes up to 5/8-inch diameter must be 1.00 inch. For larger than 5/8-inch diameter holes, the minimum edge distance must be 1.5 times the diameter of the largest hole.
- No holes will be allowed to exceed 0.75 inch in diameter.
- Avoid close vertical succession of fasteners.
- All attaching fasteners, including flat washers, must be of high strength steel (Grade 8).
Drilling Precautions-Motorhome
1. The frame web holes to mount brackets, outriggers, and supports may be drilled in the vertical side rail web with the following restrictions:
- The material between the edge of the hole and the inside of the upper or lower flange must be at least 38 mm (1.50 inch).
- The minimum edge distance between any two holes must be at least twice the diameter of the largest hole.
- The holes must be no larger than 19 mm (0.75 inch) in diameter. Avoid close vertical succession of fasteners.
- All attaching fasteners, including the flat washers, must be of high strength steel (Grade 8 or metric equivalent).
2. The frame flange hose may be drilled in the horizontal frame flanges with the following instructions:
- The material between the edge of the hole and the radius/edge of the flange must be at least 25 mm (1.0 inch).
- The minimum edge distance between any two holes must be at least twice the diameter of the largest hole.
- The holes must be no larger than 12.5 mm (0.5 inch) in diameter.